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Evidence of dmisteinbergite (hexagonal form of CaAl2Si2O8) in pseudotachylyte: A tool to constrain the thermal history of a seismic event
-
Fabrizio Nestola
,
Silvia Mittempergher
Published/Copyright:
April 2, 2015
Abstract
The determination of the maximum temperature achieved by friction melt (Tmelt) in pseudotachylytebearing faults is crucial to estimate earthquake source parameters (e.g., earthquake energy budgets, coseismic fault strength) on a geological basis. Here we investigated the mineralogy of a pseudotachylyte from the Gole Larghe Fault (Italian Alps) by using X-ray powder diffraction, micro-Raman spectroscopy, and EDS-equipped field emission scanning electron microscopy. In particular, we report the presence of the hexagonal polymorph of CaAl2Si2O8 (dmisteinbergite) in a pseudotachylyte. Published experimental work shows dmisteinbergite can crystallize at 1200-1400 °C by rapid quenching. Therefore, the presence of dmisteinbergite in pseudotachylyte could be a reliable geothermometer for friction melts for which Tmelt has only as yet been estimated.
Received: 2009-9-3
Accepted: 2009-10-20
Published Online: 2015-4-2
Published in Print: 2010-2-1
© 2015 by Walter de Gruyter Berlin/Boston
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- Optical spectroscopic study of natural Fe-rich Pizzo Forno staurolite at different temperatures and pressures
- Metasideronatrite: Crystal structure and its relation with sideronatrite
- Optical absorption, luminescence, and electron paramagnetic resonance (EPR) spectroscopy of crystalline to metamict zircon: Evidence for formation of uranyl, manganese, and other optically active centers
- Factors responsible for crystal-chemical variations in the solid solutions from illite to aluminoceladonite and from glauconite to celadonite
- REE diffusion in olivine
- Phase transition induced by solid solution: The BCa-BMg substitution in richteritic amphiboles
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